Dashboard messed up

Hello all,
I just installed Piwik in order to make a start with making websites that are compliant with the new Dutch “cookielaw”.
So far, so good, but my vistor log seems stuck in displaying at the “maximise” setting.
Now that some visitors have come to the (new) site, the vistitor log has grown so big that it messes up the whole layout. Can’t reach the topbar anymore so I have no idea how to solve this.

See attached screenshot.

[attachment 693 piwik.png]

can you reproduce the issue on demo.piwik.org or simply in your piwik?

if you try with a different browser maybe?